Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
NidZ- Hero:
--- Quote from: ~VIN1094~ on June 05, 2010, 07:54:11 pm ---Hydrogen Sulfide = H2S
H - 1
S - 2, 8, 6
would be something like..
oo
o o
H S H
x x
oo
--- End quote ---
thanz pal :)
sarasa:
--- Quote from: Nidzzz on June 05, 2010, 09:39:08 pm ---HEATING HYDROXIDES
Sodium hydroxide and potassium hydroxide are NOT CHANGED by heating
them.
Calcium hydroxide and magnesium hydroxide behave in the same way.
HYDROXIDE + HEAT = OXIDE + WATER
Ca(OH)2(aq) = CaO(s) + H2O(l)
Mg(OH)2(aq) = MgO(s) + H2O(l)
Iron (III) hydroxide is also decomposed by heating to form iron (III) oxide and
water.
2Fe(OH)3(s) = Fe2O3(s) + 3H2O(l)
HEATING NITRATES
Group 1 nitrate + heat = group 1 nitrite + oxygen gas
2NaNO3(s) = 2NaNO2 + O2(g)
2KNO3(s) = 2NKNO2 + O2(g)
All other nitrates behave in the same way when heated
NITRATE + HEAT = OXIDE + NITRITE + OXYGEN GAS
2Ca(NO3)2 = 2CaO(S) + 4NO2(g) + O2(g)
2Cu(NO3)2 = 2CuO(S) + 4NO2(g) + O2(g)
2Zn(NO3)2 = 2ZnO(S) + 4NO2(g) + O2(g)
--- End quote ---
NITRATE + HEAT = OXIDE + NITROGEN DIOXIDE + OXYGEN GAS
Raywin:
--- Quote from: ~VIN1094~ on June 05, 2010, 08:44:14 pm ---Nitrates of Na and K decompose, but in a different way.. products are different
2 Zn(NO3)2 ----> 2ZnO + 4 NO2 + O2
2 KNO3 ----> 2 KNO2 + O2
Hg(NO3)2 ----> 2Ag + 2NO2 + O2
2AgNO3 ----> 2Ag + 2 NO2 + O2
Yup only Na and K
okay, not sure about nitrites, because they are formed by the decomposition of (K, Na)nitrates itself..
--- End quote ---
Hey Vin,
Hg(NO3)2 ----> 2Ag + 2NO2 + O2 Where did the Ag come from? ??? lol isnt it supposed to be Hg? :P
Vin:
--- Quote from: Raywin on June 06, 2010, 03:35:26 am ---Hey Vin,
Hg(NO3)2 ----> 2Ag + 2NO2 + O2 Where did the Ag come from? ??? lol isnt it supposed to be Hg? :P
--- End quote ---
Oh sorry dude. I was in a hurry... :-[
Raywin:
--- Quote from: ~VIN1094~ on June 06, 2010, 06:39:27 am ---Oh sorry dude. I was in a hurry... :-[
--- End quote ---
Hahaha, np. :D
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